(chocolateyGH-121) Add files service

Add ability to read and save package file information.

src/chocolatey/chocolatey.csproj

@@ -104,6 +104,8 @@
     <Compile Include="infrastructure.app\runners\GenericRunner.cs" />
     <Compile Include="infrastructure.app\services\AutomaticUninstallerService.cs" />
     <Compile Include="infrastructure.app\services\ChocolateyConfigSettingsService.cs" />
+    <Compile Include="infrastructure.app\services\FilesService.cs" />
+    <Compile Include="infrastructure.app\services\IFilesService.cs" />
     <Compile Include="infrastructure\adapters\CustomString.cs" />
     <Compile Include="infrastructure.app\services\IChocolateyConfigSettingsService.cs" />
     <Compile Include="infrastructure.app\configuration\ConfigFileApiKeySetting.cs" />

src/chocolatey/infrastructure.app/registration/ContainerBinding.cs

@@ -53,6 +53,7 @@ public void RegisterComponents(Container container)
             container.Register<IChocolateyPackageInformationService, ChocolateyPackageInformationService>(Lifestyle.Singleton);
             container.Register<IShimGenerationService, ShimGenerationService>(Lifestyle.Singleton);
             container.Register<IRegistryService, RegistryService>(Lifestyle.Singleton);
+            container.Register<IFilesService, FilesService>(Lifestyle.Singleton);
             container.Register<ITemplateService, TemplateService>(Lifestyle.Singleton);
             container.Register<IChocolateyConfigSettingsService, ChocolateyConfigSettingsService>(Lifestyle.Singleton);
             container.Register<IChocolateyPackageService, ChocolateyPackageService>(Lifestyle.Singleton);

src/chocolatey/infrastructure.app/services/FilesService.cs

@@ -0,0 +1,48 @@
+// Copyright © 2011 - Present RealDimensions Software, LLC
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// 
+// You may obtain a copy of the License at
+// 
+// 	http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace chocolatey.infrastructure.app.services
+{
+    using domain;
+    using filesystem;
+    using infrastructure.services;
+
+    public sealed class FilesService : IFilesService
+    {
+        private readonly IXmlService _xmlService;
+        private readonly IFileSystem _fileSystem;
+
+        public FilesService(IXmlService xmlService, IFileSystem fileSystem)
+        {
+            _xmlService = xmlService;
+            _fileSystem = fileSystem;
+        }
+
+        public PackageFiles read_from_file(string filePath)
+        {
+            if (!_fileSystem.file_exists(filePath))
+            {
+                return null;
+            }
+
+            return _xmlService.deserialize<PackageFiles>(filePath);
+        }
+
+        public void save_to_file(PackageFiles snapshot, string filePath)
+        {
+            _xmlService.serialize(snapshot, filePath);
+        }
+    }
+}

src/chocolatey/infrastructure.app/services/IFilesService.cs

@@ -0,0 +1,25 @@
+// Copyright © 2011 - Present RealDimensions Software, LLC
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// 
+// You may obtain a copy of the License at
+// 
+// 	http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace chocolatey.infrastructure.app.services
+{
+    using domain;
+
+    public interface IFilesService
+    {
+        PackageFiles read_from_file(string filepath);
+        void save_to_file(PackageFiles snapshot, string filePath);
+    }
+}